Chuck.



J. H. GREAVES & G. G. LUCAS.

CHUCK.

APPLICATION FILED APB.16, 1913.

1,1 10,770. Patented Sept. 15, 1914.

Copies of this patent may be obtained for UNITED STATES PATENT, OFFICE.

JOHN H. ennavns Ann CHARLES e. LuoAs, or nnwron'r NEWS, VIRGINIA.

c UcK.

, Specification of Letters Patent.

Patented Sept. 15,1914.

Application filed April 16, 1913. Serial No. 761,592.

To all whom it may concern Be it known that we,

(1) JoHN H.

Gnnnvns, and (2) CHARLES G. LUCAS, citizens of the United States,residing at 217 Thirty-fifth street and (2) 122 Thirtyfifth street, inthe city of Newport News,

county of Warwick and State of Virginia,

vented, as far as possible, from access to the working parts of thechuck. I I

These and other objects we attain by the construction shown in theaccompanying drawings in which- I Figure 1 is a section on Fig. 2; Fig.2 is a bottom plan view; and Fig. 33 is a section of the adjustingblock.

Referring to the drawings, l'is the shank of the chuck, having integraltherewith the hollow spindle 2. This spindle has on one side a series ofopenings 8, into any one of which may project the pin 4: of an adjustingblock 5, which is arranged to slide in the bore of the hollow spindle.The pin 4: has

a slot or hole in its outer end for engagement with a tool, and ismountedin' a socket in the adjusting block 5, this socket being of suchdepth that the pin 4 may be pushed inwardly against the compressionspring 6 in the socket, and the block thenvmoved up or down opposite toany one of the openings 3,

whereupon thespringwill force the pin out into such opening and thushold the block in its adjusted position. The block 5hasan upwardlycurved bottom in order to automatically center the drill shank. I

the" line ac 7 is a clamping nut having internal screwthreads engagingexterior threads on the end of the spindle and having a frusto-conicalopening at its lower endto engage with the correspondingly shapedclamping jaws 8' and 9. Thesejaws 8 and 9 have eachat their upper end adove-tail shaped tongue 10, fitting into a correspondingly shaped groovein the wall of the spindle, so that while these jaws may be moved by thenut? laterally toward. and from. each other to clamp and release thedrill spindle, they can not drop out when the nut is unscrewed jtorelease'the drill.

' The operation of the device will be 'ap-] parent from the foregoingdescription, from which it will be noted that the device has few parts,is light", and strong, and that the adjustment is quickly and easilyefli'ected. I

We claim 1. In a chuck, the combination with a hollow drill spindle,-ofa block arranged to slide therein,.and cooperating means on said blockand spindle-for locking the block in its adjusted position, said meanscomprising a row of openings in one wall only of the spindle, and meanscarried by said block for detachable engagement with the walls of saidopenings.

2. In a chuck, thecombination with a hollow drill spindle, ofa,block'arranged' to slide therein, and cooperating means'on said I blockand spindle for holding the blockin its 1 adjusted position, said meanscomprlsing a row of openings in the wall of the spindle, and aspring-pressed pin mounted in said block.

In testimonywhereof, we aifiX our signatures in presence of twowitnesses.

JOHN H. GREAVES.

CHAS. G. LUCAS.

Witnesses:

CHARLES DUNCAN, SoLLIn HOLLAND.

